10-10-2019
well I would like to add that you need to make sure that you always always need to have enough real free memory to support the IOs your system needs to do. If you dont, your system will stop ALL work and starts scanning and freeing up memory pages until there is sufficient free memory available and than restarts processing. If you are very low in free memory and your system had to do this frequently on a box with lots of IO, like a DB box, this is much worse for your performance than if you would run from paging space and it can grind a busy box to a complete halt - a fact that IBM support to this day prefers to completely ignore.
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LEARN ABOUT OPENDARWIN
dynamic_pager
dynamic_pager(8) BSD System Manager's Manual dynamic_pager(8)
NAME
dynamic_pager -- dynamic pager external storage manager
SYNOPSIS
dynamic_pager [-F filename] [-S filesize] [-H high-water-trigger] [-L low-water-trigger] [-P priority]
DESCRIPTION
The dynamic_pager daemon manages a pool of external swap files which the kernel uses to support demand paging. This pool is expanded with
new swap files as load on the system increases, and contracted when the swapping resources are no longer needed. The dynamic_pager daemon
also provides a notification service for those applications which wish to receive notices when the external paging pool expands or contracts.
OPTIONS
-F The base name of the filename to use for the external paging files. By default this is /private/var/vm/swapfile.
-S The fixed filesize [in bytes] to use for the paging files. By default dynamic_pager uses variable sized paging files, using larger
sized files as paging demands increase. The -S, -H and -L options disable that default and cause dynamic_pager to use a series of
fixed sized external paging files.
-H If there are less than high-water-trigger bytes free in the external paging files, the kernel will signal dynamic_pager to add a new
external paging file.
-L If there are more than low-water-trigger bytes free in the external paging files, the kernel will coalese in-use pages and signal
dynamic_pager to discard an external paging file. Low-water-trigger must be greater than high-water-trigger + filesize.
-P This option is currently unimplemented.
FILES
/private/var/vm/swapfile* Default external paging files.
SEE ALSO
macx_swapon(2), macx_swapoff(2).
Mac OS X July 8, 2003 Mac OS X